UN to appoint fourth envoy to Yemen: 'World's worst humanitarian crisis'
World body takes the heat as Houthis, government accuse successive post-holders of
partiality.
13-year-old Kholood (C) and her two sisters, Jana and Anhar, go to school, Taizz, Yemen, Feb. 2021.(photo credit: UNICEF/AL-BASHA)ByMOHAMED SAYERS / THE MEDIA LINE
